It happens to me time again. To try and help you I attempt to classify trades according to what I think they're overall riskiness is. Unfortunately for me the markets like to make a liar out of me and fulfill the HIGH risk trades and balk on the low risk ones. This is exactly what happened with our HIGH risk Cocoa trade Monday. Cocoa had no trouble filling our order but the lower risk Soybean trade didn't even get close (in fact it went the other way) from what was expected.
I think from now on I'll just rate everything as a HIGH risk trade. ;-)
Welcome to trading.
Erich